【求助】请高人帮我解一下下面的微分方程组，很急切，非常感谢！ - MATLAB爱好者论坛-LabFans.com

slgu · 2008-03-12, 15:34

[y z w]=Dsolve('Dy=u*(1-x/xm)^n1*(1-p/pm)^n2*(1-s/sm)^n3*x','Dz=a*Dy+b','Dw=(-1/Y1)*Dz-(1/Y2)*Dy-m*s')
y =
-(t*m*s*Y1*Y2+t*a*u*(1-x/xm)^n1*(1-p/pm)^n2*(1-s/sm)^n3*x*Y2+t*b*Y2+u*(1-x/xm)^n1*(1-p/pm)^n2*(1-s/sm)^n3*x*t*Y1-C1*Y1*Y2)/Y1/Y2
z =
u*(1-x/xm)^n1*(1-p/pm)^n2*(1-s/sm)^n3*x*t+C3
w =
t*a*u*(1-x/xm)^n1*(1-p/pm)^n2*(1-s/sm)^n3*x+t*b+C2

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2008-03-12, 15:34	#3
slgu 高级会员注册日期: 2007-06-24 年龄: 70 帖子: 188 声望力: 21	[y z w]=Dsolve('Dy=u(1-x/xm)^n1(1-p/pm)^n2(1-s/sm)^n3x','Dz=aDy+b','Dw=(-1/Y1)Dz-(1/Y2)Dy-ms') y = -(tmsY1Y2+tau(1-x/xm)^n1(1-p/pm)^n2(1-s/sm)^n3xY2+tbY2+u(1-x/xm)^n1(1-p/pm)^n2(1-s/sm)^n3xtY1-C1Y1Y2)/Y1/Y2 z = u(1-x/xm)^n1(1-p/pm)^n2(1-s/sm)^n3xt+C3 w = tau(1-x/xm)^n1(1-p/pm)^n2(1-s/sm)^n3x+t*b+C2